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弦函数的最值点,不但可以显示函数的最大值和最小值,而且利用它还可以解决其它一些问题,请看下面的例子. 一、求三角函数的解析式例1(90年全国高考题)已知函数y=Asin(ωx+ )在同一周期内,当x=π/9时,取得最大值1/2,当x=4π/9时,取得最小值-1/2,则该函数的解析式为( )
The point value of the chord function can not only show the maximum and minimum values of the function, but also use it to solve other problems. Please see the following examples. First, find the analytical formula of the trigonometric function Example 1 (National Examination Questions for the 90th year) ) Known function y=Asin(ωx+) is in the same period, when x=π/9, the maximum value is 1/2, when x=4π/9, the minimum value is obtained by -1/2, then the function Analytic formula is ()